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三宿主蜱

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10. interface A { void x(); } 11. class B implements A { public void x() { } public voidy() { } } 12. class C extends B { public void x() {} } And: 20. java.util.List list = new java.util.ArrayList(); 21. list.add(new B()); 22. list.add(new C()); 23. for (A a:list) { 24. a.x(); 25. a.y();; 26. } What is the result?()

A. The code runs with no output.
B. An exception is thrown at runtime.
Compilation fails because of an error in line 20.
D. Compilation fails because of an error in line 21.
E. Compilation fails because of an error in line 23.
F. Compilation fails because of an error in line 25.

什么是直接顶的初次垮落?

常用模板设计需要考虑设计荷载和()。

A. 模板刚度
B. 计算荷载
C. 预拱度

常用钻床有哪几种?其共同特点是什么?

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